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https://issues.apache.org/jira/browse/SOLR-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated SOLR-3855:
-------------------------------
Attachment: SOLR-3855.patch
Initial patch:
DocValues can be:
- configured on a per-field-type basis (docValueType=...),
- enabled on a per-field basis (docValues=true/false)
and are available for the following field types:
- StrField,
- UUIDField,
- Trie*Field,
- BoolField.
When doc values are enabled, they have precedence over the field cache for
{{getValueSource}} and {{getSortField}}, however faceting and stats cannot use
doc values yet (I would like to do this as a separate issue).
I force fields that have doc values enabled to be single-valued and to be
either required or have a default value.
I also modified a lot of code (ReturnFields especially) to make DocValues
behave like stored fields. I think this would be great for ID fields. In a
cluster that has {{numShards}} shards, it would help decrease the number of
disk seeks in the .fdt file (which is often too big to fit entirely in the OS
cache) per request from {{(numShards * (start + rows) + rows)}} to {{rows}}.
The patch is not committable yet, and I have
{{BasicDistributedZkTest.testDistribSearch}} that always fails (not sure why
yet...) but I'd love to have some feedback to know whether it is going in the
right direction.
> DocValues support
> -----------------
>
> Key: SOLR-3855
> URL: https://issues.apache.org/jira/browse/SOLR-3855
> Project: Solr
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.1, 5.0
>
> Attachments: SOLR-3855.patch
>
>
> It would be nice if Solr supported DocValues:
> - for ID fields (fewer disk seeks when running distributed search),
> - for sorting/faceting/function queries (faster warmup time than fieldcache),
> - better on-disk and in-memory efficiency (you can use packed impls).
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